int main(void)
{
int i, num_factors;
mpz_t n, d, tmp, x_1, x_2;
mpz_init(n);
mpz_init(d);
mpz_init(tmp);
mpz_init(x_1);
mpz_init(x_2);
mpz_init(cp);
srand(1337);
mpz_t *factors = malloc(sizeof(mpz_t) * MAX_FACTORS);
for(i = 0; i < MAX_FACTORS; ++i) {
mpz_init(factors[i]);
}
for (i = 0; i < NUM_INPUT; ++i) {
mpz_inp_str(n, stdin, 10);
num_factors = factor(x_1, x_2, d, n, tmp, factors);
print_factors(factors, num_factors);
}
return 0;
}
int
main ()
{
int argc;
char **argv;
int fail = 0;
char *fake_argv[3];
argv = fake_argv;
argv[0] = "factor";
/*argv[1] = "81064801949712479";*/
argv[1] = "324259213033341373";
argv[2] = 0;
argc = 2;
program_name = argv[0];
{
int i;
for (i = 1; i < argc; i++)
fail |= print_factors (argv[i]);
}
return fail;
}
//----------------------- NFS ENTRY POINT ------------------------------------//
void nfs(fact_obj_t *fobj)
{
//expect the input in fobj->nfs_obj.gmp_n
char *input;
msieve_obj *obj = NULL;
char *nfs_args = NULL; // unused as yet
enum cpu_type cpu = yafu_get_cpu_type();
mp_t mpN;
factor_list_t factor_list;
uint32 flags = 0;
nfs_job_t job;
uint32 relations_needed = 1;
uint32 last_specialq = 0;
struct timeval stop; // stop time of this job
struct timeval start; // start time of this job
struct timeval bstop; // stop time of sieving batch
struct timeval bstart; // start time of sieving batch
TIME_DIFF * difference;
double t_time;
uint32 pre_batch_rels = 0;
char tmpstr[GSTR_MAXSIZE];
int process_done;
enum nfs_state_e nfs_state;
// initialize some job parameters
memset(&job, 0, sizeof(nfs_job_t));
obj_ptr = NULL;
//below a certain amount, revert to SIQS
if (gmp_base10(fobj->nfs_obj.gmp_n) < fobj->nfs_obj.min_digits)
{
mpz_set(fobj->qs_obj.gmp_n, fobj->nfs_obj.gmp_n);
SIQS(fobj);
mpz_set(fobj->nfs_obj.gmp_n, fobj->qs_obj.gmp_n);
return;
}
if (mpz_probab_prime_p(fobj->nfs_obj.gmp_n, NUM_WITNESSES))
{
add_to_factor_list(fobj, fobj->nfs_obj.gmp_n);
if (VFLAG >= 0)
gmp_printf("PRP%d = %Zd\n", gmp_base10(fobj->nfs_obj.gmp_n),
fobj->nfs_obj.gmp_n);
logprint_oc(fobj->flogname, "a", "PRP%d = %s\n",
gmp_base10(fobj->nfs_obj.gmp_n),
mpz_conv2str(&gstr1.s, 10, fobj->nfs_obj.gmp_n));
mpz_set_ui(fobj->nfs_obj.gmp_n, 1);
return;
}
if (mpz_perfect_square_p(fobj->nfs_obj.gmp_n))
{
mpz_sqrt(fobj->nfs_obj.gmp_n, fobj->nfs_obj.gmp_n);
add_to_factor_list(fobj, fobj->nfs_obj.gmp_n);
logprint_oc(fobj->flogname, "a", "prp%d = %s\n",
gmp_base10(fobj->nfs_obj.gmp_n),
mpz_conv2str(&gstr1.s, 10, fobj->nfs_obj.gmp_n));
add_to_factor_list(fobj, fobj->nfs_obj.gmp_n);
logprint_oc(fobj->flogname, "a", "prp%d = %s\n",
gmp_base10(fobj->nfs_obj.gmp_n),
mpz_conv2str(&gstr1.s, 10, fobj->nfs_obj.gmp_n));
mpz_set_ui(fobj->nfs_obj.gmp_n, 1);
return;
}
if (mpz_perfect_power_p(fobj->nfs_obj.gmp_n))
{
FILE *flog;
uint32 j;
if (VFLAG > 0)
printf("input is a perfect power\n");
factor_perfect_power(fobj, fobj->nfs_obj.gmp_n);
flog = fopen(fobj->flogname, "a");
if (flog == NULL)
{
printf("fopen error: %s\n", strerror(errno));
printf("could not open %s for appending\n", fobj->flogname);
exit(1);
}
logprint(flog,"input is a perfect power\n");
for (j=0; j<fobj->num_factors; j++)
{
uint32 k;
for (k=0; k<fobj->fobj_factors[j].count; k++)
{
logprint(flog,"prp%d = %s\n",gmp_base10(fobj->fobj_factors[j].factor),
mpz_conv2str(&gstr1.s, 10, fobj->fobj_factors[j].factor));
}
}
fclose(flog);
return;
}
if (fobj->nfs_obj.filearg[0] != '\0')
{
if (VFLAG > 0) printf("test: starting trial sieving\n");
trial_sieve(fobj);
return;
}
//initialize the flag to watch for interrupts, and set the
//pointer to the function to call if we see a user interrupt
NFS_ABORT = 0;
signal(SIGINT,nfsexit);
//start a counter for the whole job
gettimeofday(&start, NULL);
//nfs state machine:
input = (char *)malloc(GSTR_MAXSIZE * sizeof(char));
nfs_state = NFS_STATE_INIT;
process_done = 0;
while (!process_done)
{
switch (nfs_state)
{
case NFS_STATE_INIT:
// write the input bigint as a string
input = mpz_conv2str(&input, 10, fobj->nfs_obj.gmp_n);
// create an msieve_obj
// this will initialize the savefile to the outputfile name provided
obj = msieve_obj_new(input, flags, fobj->nfs_obj.outputfile, fobj->nfs_obj.logfile,
fobj->nfs_obj.fbfile, g_rand.low, g_rand.hi, (uint32)0, cpu,
(uint32)L1CACHE, (uint32)L2CACHE, (uint32)THREADS, (uint32)0, nfs_args);
fobj->nfs_obj.mobj = obj;
// initialize these before checking existing files. If poly
// select is resumed they will be changed by check_existing_files.
job.last_leading_coeff = 0;
job.poly_time = 0;
job.use_max_rels = 0;
job.snfs = NULL;
// determine what to do next based on the state of various files.
// this will set job.current_rels if it finds any
nfs_state = check_existing_files(fobj, &last_specialq, &job);
// before we get started, check to make sure we can find ggnfs sievers
// if we are going to be doing sieving
if (check_for_sievers(fobj, 1) == 1)
nfs_state = NFS_STATE_DONE;
if (VFLAG >= 0 && nfs_state != NFS_STATE_DONE)
gmp_printf("nfs: commencing nfs on c%d: %Zd\n",
gmp_base10(fobj->nfs_obj.gmp_n), fobj->nfs_obj.gmp_n);
if (nfs_state != NFS_STATE_DONE)
logprint_oc(fobj->flogname, "a", "nfs: commencing nfs on c%d: %s\n",
gmp_base10(fobj->nfs_obj.gmp_n),
mpz_conv2str(&gstr1.s, 10, fobj->nfs_obj.gmp_n));
// convert input to msieve bigint notation and initialize a list of factors
gmp2mp_t(fobj->nfs_obj.gmp_n,&mpN);
factor_list_init(&factor_list);
if (fobj->nfs_obj.rangeq > 0)
job.qrange = ceil((double)fobj->nfs_obj.rangeq / (double)THREADS);
break;
case NFS_STATE_POLY:
if ((fobj->nfs_obj.nfs_phases == NFS_DEFAULT_PHASES) ||
(fobj->nfs_obj.nfs_phases & NFS_PHASE_POLY))
{
// always check snfs forms (it is fast)
snfs_choose_poly(fobj, &job);
if( job.snfs == NULL )
{
// either we never were doing snfs, or snfs form detect failed.
// if the latter then bail with an error because the user
// explicitly wants to run snfs...
if (fobj->nfs_obj.snfs)
{
printf("nfs: failed to find snfs polynomial!\n");
exit(-1);
}
// init job.poly for gnfs
job.poly = (mpz_polys_t*)malloc(sizeof(mpz_polys_t));
if (job.poly == NULL)
{
printf("nfs: couldn't allocate memory!\n");
exit(-1);
}
mpz_polys_init(job.poly);
job.poly->rat.degree = 1; // maybe way off in the future this isn't true
// assume gnfs for now
job.poly->side = ALGEBRAIC_SPQ;
do_msieve_polyselect(fobj, obj, &job, &mpN, &factor_list);
}
else
{
fobj->nfs_obj.snfs = 1;
mpz_set(fobj->nfs_obj.gmp_n, job.snfs->n);
}
}
nfs_state = NFS_STATE_SIEVE;
break;
case NFS_STATE_SIEVE:
pre_batch_rels = job.current_rels;
gettimeofday(&bstart, NULL);
// sieve if the user has requested to (or by default). else,
// set the done sieving flag. this will prevent some infinite loops,
// for instance if we only want to post-process, but filtering
// doesn't produce a matrix. if we don't want to sieve in that case,
// then we're done.
if (((fobj->nfs_obj.nfs_phases == NFS_DEFAULT_PHASES) ||
(fobj->nfs_obj.nfs_phases & NFS_PHASE_SIEVE)) &&
!(fobj->nfs_obj.nfs_phases & NFS_DONE_SIEVING))
do_sieving(fobj, &job);
else
fobj->nfs_obj.nfs_phases |= NFS_DONE_SIEVING;
// if this has been previously marked, then go ahead and exit.
if (fobj->nfs_obj.nfs_phases & NFS_DONE_SIEVING)
process_done = 1;
// if user specified -ns with a fixed start and range,
// then mark that we're done sieving.
if (fobj->nfs_obj.rangeq > 0)
{
// we're done sieving the requested range, but there may be
// more phases to check, so don't exit yet
fobj->nfs_obj.nfs_phases |= NFS_DONE_SIEVING;
}
// then move on to the next phase
nfs_state = NFS_STATE_FILTCHECK;
break;
case NFS_STATE_FILTER:
// if we've flagged not to do filtering, then assume we have
// enough relations and move on to linear algebra
if ((fobj->nfs_obj.nfs_phases == NFS_DEFAULT_PHASES) ||
(fobj->nfs_obj.nfs_phases & NFS_PHASE_FILTER))
relations_needed = do_msieve_filtering(fobj, obj, &job);
else
relations_needed = 0;
if (relations_needed == 0)
nfs_state = NFS_STATE_LINALG;
else
{
// if we filtered, but didn't produce a matrix, raise the target
// min rels by a few percent. this will prevent too frequent
// filtering attempts while allowing the q_batch size to remain small.
if (job.current_rels > job.min_rels)
job.min_rels = job.current_rels * fobj->nfs_obj.filter_min_rels_nudge;
else
job.min_rels *= fobj->nfs_obj.filter_min_rels_nudge;
if (VFLAG > 0)
printf("nfs: raising min_rels by %1.2f percent to %u\n",
100*(fobj->nfs_obj.filter_min_rels_nudge-1), job.min_rels);
nfs_state = NFS_STATE_SIEVE;
}
break;
case NFS_STATE_LINALG:
if ((fobj->nfs_obj.nfs_phases == NFS_DEFAULT_PHASES) ||
(fobj->nfs_obj.nfs_phases & NFS_PHASE_LA) ||
(fobj->nfs_obj.nfs_phases & NFS_PHASE_LA_RESUME))
{
// msieve: build matrix
flags = 0;
flags = flags | MSIEVE_FLAG_USE_LOGFILE;
if (VFLAG > 0)
flags = flags | MSIEVE_FLAG_LOG_TO_STDOUT;
flags = flags | MSIEVE_FLAG_NFS_LA;
// add restart flag if requested
if (fobj->nfs_obj.nfs_phases & NFS_PHASE_LA_RESUME)
flags |= MSIEVE_FLAG_NFS_LA_RESTART;
obj->flags = flags;
if (VFLAG >= 0)
printf("nfs: commencing msieve linear algebra\n");
logprint_oc(fobj->flogname, "a", "nfs: commencing msieve linear algebra\n");
// use a different number of threads for the LA, if requested
if (LATHREADS > 0)
{
msieve_obj_free(obj);
obj = msieve_obj_new(input, flags, fobj->nfs_obj.outputfile, fobj->nfs_obj.logfile,
fobj->nfs_obj.fbfile, g_rand.low, g_rand.hi, (uint32)0, cpu,
(uint32)L1CACHE, (uint32)L2CACHE, (uint32)LATHREADS, (uint32)0, nfs_args);
}
// try this hack - store a pointer to the msieve obj so that
// we can change a flag on abort in order to interrupt the LA.
obj_ptr = obj;
nfs_solve_linear_system(obj, fobj->nfs_obj.gmp_n);
if (obj_ptr->flags & MSIEVE_FLAG_STOP_SIEVING)
nfs_state = NFS_STATE_DONE;
else
{
// check for a .dat.deps file. if we don't have one, assume
// its because the job was way oversieved and only trivial
// dependencies were found. try again from filtering with
// 20% less relations.
FILE *t;
sprintf(tmpstr, "%s.dep", fobj->nfs_obj.outputfile);
if ((t = fopen(tmpstr, "r")) == NULL)
{
if (job.use_max_rels > 0)
{
// we've already tried again with an attempted fix to the trivial
// dependencies problem, so either that wasn't the problem or
// it didn't work. either way, give up.
printf("nfs: no dependency file retry failed\n");
fobj->flags |= FACTOR_INTERRUPT;
nfs_state = NFS_STATE_DONE;
}
else
{
// this should be sufficient to produce a matrix, but not too much
// to trigger the assumed failure mode.
if (job.min_rels == 0)
{
// if min_rels is not set, then we need to parse the .job file to compute it.
parse_job_file(fobj, &job);
nfs_set_min_rels(&job);
}
job.use_max_rels = job.min_rels * 1.5;
printf("nfs: no dependency file found - trying again with %u relations\n",
job.use_max_rels);
nfs_state = NFS_STATE_FILTER;
}
}
else
{
fclose(t);
nfs_state = NFS_STATE_SQRT;
}
}
// set the msieve threads back to where it was if we used
// a different amount for linalg
if (LATHREADS > 0)
{
msieve_obj_free(obj);
obj = msieve_obj_new(input, flags, fobj->nfs_obj.outputfile, fobj->nfs_obj.logfile,
fobj->nfs_obj.fbfile, g_rand.low, g_rand.hi, (uint32)0, cpu,
(uint32)L1CACHE, (uint32)L2CACHE, (uint32)THREADS, (uint32)0, nfs_args);
}
obj_ptr = NULL;
}
else // not doing linalg
nfs_state = NFS_STATE_SQRT;
break;
case NFS_STATE_SQRT:
if ((fobj->nfs_obj.nfs_phases == NFS_DEFAULT_PHASES) ||
(fobj->nfs_obj.nfs_phases & NFS_PHASE_SQRT))
{
uint32 retcode;
// msieve: find factors
flags = 0;
flags = flags | MSIEVE_FLAG_USE_LOGFILE;
if (VFLAG > 0)
flags = flags | MSIEVE_FLAG_LOG_TO_STDOUT;
flags = flags | MSIEVE_FLAG_NFS_SQRT;
obj->flags = flags;
if (VFLAG >= 0)
printf("nfs: commencing msieve sqrt\n");
logprint_oc(fobj->flogname, "a", "nfs: commencing msieve sqrt\n");
// try this hack - store a pointer to the msieve obj so that
// we can change a flag on abort in order to interrupt the sqrt.
obj_ptr = obj;
retcode = nfs_find_factors(obj, fobj->nfs_obj.gmp_n, &factor_list);
obj_ptr = NULL;
if (retcode)
{
extract_factors(&factor_list,fobj);
if (mpz_cmp_ui(fobj->nfs_obj.gmp_n, 1) == 0)
nfs_state = NFS_STATE_CLEANUP; //completely factored, clean up everything
else
nfs_state = NFS_STATE_DONE; //not factored completely, keep files and stop
}
else
{
if (VFLAG >= 0)
{
printf("nfs: failed to find factors... possibly no dependencies found\n");
printf("nfs: continuing with sieving\n");
}
logprint_oc(fobj->flogname, "a", "nfs: failed to find factors... "
"possibly no dependencies found\n"
"nfs: continuing with sieving\n");
nfs_state = NFS_STATE_SIEVE;
}
}
else
nfs_state = NFS_STATE_DONE; //not factored completely, keep files and stop
break;
case NFS_STATE_CLEANUP:
remove(fobj->nfs_obj.outputfile);
remove(fobj->nfs_obj.fbfile);
sprintf(tmpstr, "%s.p",fobj->nfs_obj.outputfile); remove(tmpstr);
sprintf(tmpstr, "%s.br",fobj->nfs_obj.outputfile); remove(tmpstr);
sprintf(tmpstr, "%s.cyc",fobj->nfs_obj.outputfile); remove(tmpstr);
sprintf(tmpstr, "%s.dep",fobj->nfs_obj.outputfile); remove(tmpstr);
sprintf(tmpstr, "%s.hc",fobj->nfs_obj.outputfile); remove(tmpstr);
sprintf(tmpstr, "%s.mat",fobj->nfs_obj.outputfile); remove(tmpstr);
sprintf(tmpstr, "%s.lp",fobj->nfs_obj.outputfile); remove(tmpstr);
sprintf(tmpstr, "%s.d",fobj->nfs_obj.outputfile); remove(tmpstr);
sprintf(tmpstr, "%s.mat.chk",fobj->nfs_obj.outputfile); remove(tmpstr);
gettimeofday(&stop, NULL);
difference = my_difftime (&start, &stop);
t_time = ((double)difference->secs + (double)difference->usecs / 1000000);
free(difference);
if (VFLAG >= 0)
printf("NFS elapsed time = %6.4f seconds.\n",t_time);
logprint_oc(fobj->flogname, "a", "NFS elapsed time = %6.4f seconds.\n",t_time);
logprint_oc(fobj->flogname, "a", "\n");
logprint_oc(fobj->flogname, "a", "\n");
// free stuff
nfs_state = NFS_STATE_DONE;
break;
case NFS_STATE_DONE:
process_done = 1;
break;
case NFS_STATE_FILTCHECK:
if (job.current_rels >= job.min_rels)
{
if (VFLAG > 0)
printf("nfs: found %u relations, need at least %u, proceeding with filtering ...\n",
job.current_rels, job.min_rels);
nfs_state = NFS_STATE_FILTER;
}
else
{
// compute eta by dividing how many rels we have left to find
// by the average time per relation. we have average time
// per relation because we've saved the time it took to do
// the last batch of sieving and we know how many relations we
// found in that batch.
uint32 est_time;
gettimeofday(&bstop, NULL);
difference = my_difftime (&bstart, &bstop);
t_time = ((double)difference->secs + (double)difference->usecs / 1000000);
free(difference);
est_time = (uint32)((job.min_rels - job.current_rels) *
(t_time / (job.current_rels - pre_batch_rels)));
// if the user doesn't want to sieve, then we can't make progress.
if ((fobj->nfs_obj.nfs_phases == NFS_DEFAULT_PHASES) ||
(fobj->nfs_obj.nfs_phases & NFS_PHASE_SIEVE))
{
if (VFLAG > 0)
printf("nfs: found %u relations, need at least %u "
"(filtering ETA: %uh %um), continuing with sieving ...\n", // uh... um... hmm... idk *shrug*
job.current_rels, job.min_rels, est_time / 3600,
(est_time % 3600) / 60);
nfs_state = NFS_STATE_SIEVE;
}
else
{
if (VFLAG > 0)
printf("nfs: found %u relations, need at least %u "
"(filtering ETA: %uh %um), sieving not selected, finishing ...\n",
job.current_rels, job.min_rels, est_time / 3600,
(est_time % 3600) / 60);
nfs_state = NFS_STATE_DONE;
}
}
break;
case NFS_STATE_STARTNEW:
nfs_state = NFS_STATE_POLY;
// create a new directory for this job
//#ifdef _WIN32
// sprintf(tmpstr, "%s\%s", fobj->nfs_obj.ggnfs_dir,
// mpz_conv2str(&gstr1.s, 10, fobj->nfs_obj.gmp_n));
// mkdir(tmpstr);
//#else
// sprintf(tmpstr, "%s/%s", fobj->nfs_obj.ggnfs_dir,
// mpz_conv2str(&gstr1.s, 10, fobj->nfs_obj.gmp_n));
// mkdir(tmpstr, S_IRWXU);
//#endif
// point msieve and ggnfs to the new directory
//#ifdef _WIN32
// sprintf(fobj->nfs_obj.outputfile, "%s\%s",
// tmpstr, fobj->nfs_obj.outputfile);
// sprintf(fobj->nfs_obj.logfile, "%s\%s",
// tmpstr, fobj->nfs_obj.logfile);
// sprintf(fobj->nfs_obj.fbfile, "%s\%s",
// tmpstr, fobj->nfs_obj.fbfile);
//#else
// sprintf(fobj->nfs_obj.outputfile, "%s%s",
// tmpstr, fobj->nfs_obj.outputfile);
// sprintf(fobj->nfs_obj.logfile, "%s%s",
// tmpstr, fobj->nfs_obj.logfile);
// sprintf(fobj->nfs_obj.fbfile, "%s%s",
// tmpstr, fobj->nfs_obj.fbfile);
//
//#endif
//
// msieve_obj_free(fobj->nfs_obj.mobj);
// obj = msieve_obj_new(input, flags, fobj->nfs_obj.outputfile, fobj->nfs_obj.logfile,
// fobj->nfs_obj.fbfile, g_rand.low, g_rand.hi, (uint32)0, nfs_lower, nfs_upper, cpu,
// (uint32)L1CACHE, (uint32)L2CACHE, (uint32)THREADS, (uint32)0, (uint32)0, 0.0);
// fobj->nfs_obj.mobj = obj;
//
// printf("output: %s\n", fobj->nfs_obj.mobj->savefile.name);
// printf("log: %s\n", fobj->nfs_obj.mobj->logfile_name);
// printf("fb: %s\n", fobj->nfs_obj.mobj->nfs_fbfile_name);
break;
// should really be "resume_job", since we do more than just resume sieving...
case NFS_STATE_RESUMESIEVE:
// last_specialq == 0 if:
// 1) user specifies -R and -ns with params
// 2) user specifies post processing steps only
// 3) user wants to resume sieving (either with a solo -ns or no arguements)
// but no data file or special-q was found
// 4) -R was not specified (but then we won't be in this state, we'll be in DONE)
// last_specialq > 1 if:
// 5) user wants to resume sieving (either with a solo -ns or no arguements)
// and a data file and special-q was found
// 6) it contains poly->time info (in which case we'll be in NFS_STATE_RESUMEPOLY)
strcpy(tmpstr, "");
if ((last_specialq == 0) &&
((fobj->nfs_obj.nfs_phases == NFS_DEFAULT_PHASES) ||
(fobj->nfs_obj.nfs_phases & NFS_PHASE_SIEVE)))
{
// this if-block catches cases 1 and 3 from above
uint32 missing_params = parse_job_file(fobj, &job);
// set min_rels.
get_ggnfs_params(fobj, &job);
fill_job_file(fobj, &job, missing_params);
// if any ggnfs params are missing, fill them
// this means the user can provide an SNFS poly or external GNFS poly,
// but let YAFU choose the other params
// this won't override any params in the file.
if (fobj->nfs_obj.startq > 0)
{
job.startq = fobj->nfs_obj.startq;
sprintf(tmpstr, "nfs: resuming with sieving at user specified special-q %u\n",
job.startq);
}
else
{
// this is a guess, may be completely wrong
job.startq = (job.poly->side == RATIONAL_SPQ ? job.rlim : job.alim) / 2;
sprintf(tmpstr, "nfs: continuing with sieving - could not determine "
"last special q; using default startq\n");
}
// next step is sieving
nfs_state = NFS_STATE_SIEVE;
}
else if ((last_specialq == 0) &&
((fobj->nfs_obj.nfs_phases & NFS_PHASE_FILTER) ||
(fobj->nfs_obj.nfs_phases & NFS_PHASE_LA) ||
(fobj->nfs_obj.nfs_phases & NFS_PHASE_LA_RESUME) ||
(fobj->nfs_obj.nfs_phases & NFS_PHASE_SQRT)))
{
// this if-block catches case 2 from above
// with these options we don't check for the last special-q, so this isn't
// really a new factorization
if ((fobj->nfs_obj.nfs_phases & NFS_PHASE_FILTER))
{
nfs_state = NFS_STATE_FILTCHECK;
sprintf(tmpstr, "nfs: resuming with filtering\n");
}
else if ((fobj->nfs_obj.nfs_phases & NFS_PHASE_LA) ||
(fobj->nfs_obj.nfs_phases & NFS_PHASE_LA_RESUME))
{
nfs_state = NFS_STATE_LINALG;
sprintf(tmpstr, "nfs: resuming with linear algebra\n");
}
else if (fobj->nfs_obj.nfs_phases & NFS_PHASE_SQRT)
{
nfs_state = NFS_STATE_SQRT;
sprintf(tmpstr, "nfs: resuming with sqrt\n");
}
}
else // data file already exists
{
// this if-block catches case 5 from above
(void) parse_job_file(fobj, &job);
// set min_rels.
get_ggnfs_params(fobj, &job);
if (fobj->nfs_obj.startq > 0)
{
// user wants to resume sieving.
// i don't believe this case is ever executed...
// because if startq is > 0, then last_specialq will be 0...
job.startq = fobj->nfs_obj.startq;
nfs_state = NFS_STATE_SIEVE;
}
else
{
job.startq = last_specialq;
// we found some relations - find the appropriate state
// given user input
if ((fobj->nfs_obj.nfs_phases == NFS_DEFAULT_PHASES) ||
(fobj->nfs_obj.nfs_phases & NFS_PHASE_FILTER))
{
nfs_state = NFS_STATE_FILTCHECK;
sprintf(tmpstr, "nfs: resuming with filtering\n");
}
else if (fobj->nfs_obj.nfs_phases & NFS_PHASE_SIEVE)
{
nfs_state = NFS_STATE_SIEVE;
sprintf(tmpstr, "nfs: resuming with sieving at special-q = %u\n",
last_specialq);
}
else if ((fobj->nfs_obj.nfs_phases & NFS_PHASE_LA) ||
(fobj->nfs_obj.nfs_phases & NFS_PHASE_LA_RESUME))
{
nfs_state = NFS_STATE_LINALG;
sprintf(tmpstr, "nfs: resuming with linear algebra\n");
}
else if (fobj->nfs_obj.nfs_phases & NFS_PHASE_SQRT)
{
nfs_state = NFS_STATE_SQRT;
sprintf(tmpstr, "nfs: resuming with sqrt\n");
}
}
}
if (VFLAG >= 0)
printf("%s", tmpstr);
logprint_oc(fobj->flogname, "a", "%s", tmpstr);
// if there is a job file and the user has specified -np, print
// this warning.
if (fobj->nfs_obj.nfs_phases & NFS_PHASE_POLY)
{
printf("WARNING: .job file exists! If you really want to redo poly selection,"
" delete the .job file.\n");
// non ideal solution to infinite loop in factor() if we return without factors
// (should return error code instead)
NFS_ABORT = 1;
process_done = 1;
}
break;
case NFS_STATE_RESUMEPOLY:
if (VFLAG > 1) printf("nfs: resuming poly select\n");
fobj->nfs_obj.polystart = job.last_leading_coeff;
nfs_state = NFS_STATE_POLY;
break;
default:
printf("unknown state, bailing\n");
// non ideal solution to infinite loop in factor() if we return without factors
// (should return error code instead)
NFS_ABORT = 1;
break;
}
//after every state, check elasped time against a specified timeout value
gettimeofday(&stop, NULL);
difference = my_difftime (&start, &stop);
t_time = ((double)difference->secs + (double)difference->usecs / 1000000);
free(difference);
if ((fobj->nfs_obj.timeout > 0) && (t_time > (double)fobj->nfs_obj.timeout))
{
if (VFLAG >= 0)
printf("NFS timeout after %6.4f seconds.\n",t_time);
logprint_oc(fobj->flogname, "a", "NFS timeout after %6.4f seconds.\n",t_time);
process_done = 1;
}
if (NFS_ABORT)
{
print_factors(fobj);
exit(1);
}
}
//reset signal handler to default (no handler).
signal(SIGINT,NULL);
if (obj != NULL)
msieve_obj_free(obj);
free(input);
if( job.snfs )
{
snfs_clear(job.snfs);
free(job.snfs);
}
else if( job.poly )
{
mpz_polys_free(job.poly);
free(job.poly);
}
return;
}
// top level routine: the only one visible to the rest of the program
void pollard_loop(fact_obj_t *fobj)
{
//run pollard's p-1 algorithm once on the input, using a
//32 bit random base
//expects the input in pm1_obj->gmp_n
mpz_t d,t;
FILE *flog;
clock_t start, stop;
double tt;
//check for trivial cases
if ((mpz_cmp_ui(fobj->pm1_obj.gmp_n, 1) == 0) || (mpz_cmp_ui(fobj->pm1_obj.gmp_n, 0) == 0))
return;
if (mpz_cmp_ui(fobj->pm1_obj.gmp_n, 2) == 0)
return;
start = clock();
//open the log file
flog = fopen(fobj->flogname,"a");
if (flog == NULL)
{
printf("fopen error: %s\n", strerror(errno));
printf("could not open %s for writing\n",fobj->flogname);
return;
}
if (mpz_probab_prime_p(fobj->pm1_obj.gmp_n, NUM_WITNESSES))
{
logprint(flog,"prp%d = %s\n", gmp_base10(fobj->pm1_obj.gmp_n),
mpz_conv2str(&gstr1.s, 10, fobj->pm1_obj.gmp_n));
add_to_factor_list(fobj, fobj->pm1_obj.gmp_n);
stop = clock();
tt = (double)(stop - start)/(double)CLOCKS_PER_SEC;
mpz_set_ui(fobj->pm1_obj.gmp_n, 1);
fclose(flog);
return;
}
//initialize the flag to watch for interrupts, and set the
//pointer to the function to call if we see a user interrupt
PM1_ABORT = 0;
signal(SIGINT,pm1exit);
//initialize some local args
mpz_init(d);
mpz_init(t);
pm1_init(fobj);
pm1_print_B1_B2(fobj,flog);
pm1_wrapper(fobj);
//check to see if 'f' is non-trivial
if ((mpz_cmp_ui(fobj->pm1_obj.gmp_f, 1) > 0)
&& (mpz_cmp(fobj->pm1_obj.gmp_f, fobj->pm1_obj.gmp_n) < 0))
{
//non-trivial factor found
stop = clock();
tt = (double)(stop - start)/(double)CLOCKS_PER_SEC;
//check if the factor is prime
if (mpz_probab_prime_p(fobj->pm1_obj.gmp_f, NUM_WITNESSES))
{
add_to_factor_list(fobj, fobj->pm1_obj.gmp_f);
if (VFLAG > 0)
gmp_printf("pm1: found prp%d factor = %Zd\n",
gmp_base10(fobj->pm1_obj.gmp_f), fobj->pm1_obj.gmp_f);
logprint(flog,"prp%d = %s\n",
gmp_base10(fobj->pm1_obj.gmp_f),
mpz_conv2str(&gstr1.s, 10, fobj->pm1_obj.gmp_f));
}
else
{
add_to_factor_list(fobj, fobj->pm1_obj.gmp_f);
if (VFLAG > 0)
gmp_printf("pm1: found c%d factor = %Zd\n",
gmp_base10(fobj->pm1_obj.gmp_f), fobj->pm1_obj.gmp_f);
logprint(flog,"c%d = %s\n",
gmp_base10(fobj->pm1_obj.gmp_f),
mpz_conv2str(&gstr1.s, 10, fobj->pm1_obj.gmp_f));
}
start = clock();
//reduce input
mpz_tdiv_q(fobj->pm1_obj.gmp_n, fobj->pm1_obj.gmp_n, fobj->pm1_obj.gmp_f);
}
fclose(flog);
pm1_finalize(fobj);
//watch for an abort
if (PM1_ABORT)
{
print_factors(fobj);
exit(1);
}
signal(SIGINT,NULL);
mpz_clear(d);
mpz_clear(t);
return;
}
void williams_loop(fact_obj_t *fobj)
{
//use william's p+1 algorithm 'trials' times on n.
//we allow multiple trials since we may not always get a p+1 group
//with our random choice of base
//expects the input in pp1_obj->gmp_n
mpz_t d,t;
int i,it,trials = fobj->pp1_obj.numbases;
FILE *flog;
clock_t start, stop;
double tt;
//check for trivial cases
if ((mpz_cmp_ui(fobj->pp1_obj.gmp_n, 1) == 0) || (mpz_cmp_ui(fobj->pp1_obj.gmp_n, 0) == 0))
return;
if (mpz_cmp_ui(fobj->pp1_obj.gmp_n, 2) == 0)
return;
//open the log file
flog = fopen(fobj->flogname,"a");
if (flog == NULL)
{
printf("fopen error: %s\n", strerror(errno));
printf("could not open %s for appending\n",fobj->flogname);
return;
}
//initialize the flag to watch for interrupts, and set the
//pointer to the function to call if we see a user interrupt
PP1_ABORT = 0;
signal(SIGINT,pp1exit);
//initialize some local args
mpz_init(d);
mpz_init(t);
pp1_init(fobj);
i=0;
while (i < trials)
{
//watch for an abort
if (PP1_ABORT)
{
print_factors(fobj);
exit(1);
}
start = clock();
if (is_mpz_prp(fobj->pp1_obj.gmp_n))
{
logprint(flog,"prp%d = %s\n", gmp_base10(fobj->pp1_obj.gmp_n),
mpz_conv2str(&gstr1.s, 10, fobj->pp1_obj.gmp_n));
add_to_factor_list(fobj, fobj->pp1_obj.gmp_n);
stop = clock();
tt = (double)(stop - start)/(double)CLOCKS_PER_SEC;
mpz_set_ui(fobj->pp1_obj.gmp_n, 1);
break;
}
fobj->pp1_obj.base = spRand(3,MAX_DIGIT);
pp1_print_B1_B2(fobj,flog);
it = pp1_wrapper(fobj);
//check to see if 'f' is non-trivial
if ((mpz_cmp_ui(fobj->pp1_obj.gmp_f, 1) > 0)
&& (mpz_cmp(fobj->pp1_obj.gmp_f, fobj->pp1_obj.gmp_n) < 0))
{
//non-trivial factor found
stop = clock();
tt = (double)(stop - start)/(double)CLOCKS_PER_SEC;
//check if the factor is prime
if (is_mpz_prp(fobj->pp1_obj.gmp_f))
{
add_to_factor_list(fobj, fobj->pp1_obj.gmp_f);
if (VFLAG > 0)
gmp_printf("pp1: found prp%d factor = %Zd\n",
gmp_base10(fobj->pp1_obj.gmp_f),fobj->pp1_obj.gmp_f);
logprint(flog,"prp%d = %s\n",
gmp_base10(fobj->pp1_obj.gmp_f),
mpz_conv2str(&gstr1.s, 10, fobj->pp1_obj.gmp_f));
}
else
{
add_to_factor_list(fobj, fobj->pp1_obj.gmp_f);
if (VFLAG > 0)
gmp_printf("pp1: found c%d factor = %Zd\n",
gmp_base10(fobj->pp1_obj.gmp_f),fobj->pp1_obj.gmp_f);
logprint(flog,"c%d = %s\n",
gmp_base10(fobj->pp1_obj.gmp_f),
mpz_conv2str(&gstr1.s, 10, fobj->pp1_obj.gmp_f));
}
start = clock();
//reduce input
mpz_tdiv_q(fobj->pp1_obj.gmp_n, fobj->pp1_obj.gmp_n, fobj->pp1_obj.gmp_f);
i++;
break;
}
i++;
}
fclose(flog);
pp1_finalize(fobj);
signal(SIGINT,NULL);
mpz_clear(d);
mpz_clear(t);
return;
}
int main(void) {
printf("The factors of %llu are:\n",N);
print_factors(N);
return 0;
}
